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Investment Securities - Investments' Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value    
Less than 12 Months $ 523,718 $ 15,019
12 Months or Longer 0 0
Total 523,718 15,019
Gross Unrealized Losses    
Less than 12 Months 7,889 349
12 Months or Longer 0 0
Total 7,889 349
State and municipal    
Fair Value    
Less than 12 Months 63,102 5,368
12 Months or Longer 0 0
Total 63,102 5,368
Gross Unrealized Losses    
Less than 12 Months 518 246
12 Months or Longer 0 0
Total 518 246
U.S. Government-sponsored mortgage-backed securities    
Fair Value    
Less than 12 Months 460,616 9,651
12 Months or Longer 0 0
Total 460,616 9,651
Gross Unrealized Losses    
Less than 12 Months 7,371 103
12 Months or Longer 0 0
Total $ 7,371 $ 103